Modular rack



FIG. 1 is a perspective view of the modular rack according to our new design;

FIG. 2 side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for modular rack, as shown and described. 